Campostoma spadiceum

Populations representing this species formerly were assigned to Campostoma anomalum pullum. Campostoma spadiceum was recognized as a distinct species and redescribed by Cashner et al. (2010).

Campostoma spadiceum occurs in portions of the Red, Ouachita, and lower Arkansas river basins from eastern Oklahoma to central Arkansas (Cashner et al. 2010). In the Red River basin, this species occurs in the Muddy Boggy, Kiamichi, Little, Glover, Mountain Fork, Rolling Fork, Cossatot, and Saline river systems (Cashner et al. 2010). In the Ouachita River basin, it occurs in the Little Missouri, Caddo, and Ouachita rivers (Cashner et al. 2010). In the Arkansas River basin, it occurs in the Poteau, Mulberry, Petit Jean, and Fourche La Fave rivers, in the eastern part of the Canadian River drainage before it joins the Arkansas River, and in numerous small, direct tributaries of the Arkansas River; it is also found in the smaller Arkansas River tributaries from Sans Bois Creek (Haskell County, Oklahoma) to Brodie Creek near Little Rock (Pulaski County, Arkansas) (Cashner et al. 2010). The range to the east (south of the Arkansas River) extends to well below the Fall Line, based on collections near Nashville, Arkadelphia, and Little Rock, Arkansas (Cashner et al. 2010). The distributional limits are not precisely known in the northwestern part of its range, especially in the Illinois River drainage (Cashner et al. 2010).

This species is represented by at least a few dozen distinct occurrences (subpopulations) (see map in Cashner et al. 2010).

This species is widespread and abundant in streams throughout its range, and it appears secure from a conservation perspective, unless there is widespread water withdrawal or region-wide deterioration of water quality (Cashner et al. 2010).